422 



RECORDS OF THE AUSTRALIAN MUSEUM. 



minute transparent 

 cavities in the de- 



I. — Werris Ck., N.S. Wales ; taken fur water -4540 gram 

 general -7504 gram. 



II.— Table Mt., Colorado. 1^^ 



III.— Calculated for CaO. AL.Og. SSiO,.. 3H,0. 



HEULANDITE. 



Werris Creek, New South Wales. 

 (Plate Ixxviii., fig. 7). 



At Werris Creek heulandite occurs as 

 colourless crystals lining small amygdaloidal 

 composed rock. It has the usual pearly lustre on the clinopina- 

 coidal cleavages, which are found to be perpendicular to an acute 

 positive bisectrix, thus distinguishing the mineral from stilbite 

 which otherwise it resembles closely. The crystals liaxe the 

 characteristic coffin shape, the forms present being b (010), m 

 (110), X (021), f, (201), u (111), .s (2"01). The available material 

 is Uh) scanty to permit an analysis. 



STILBITE. 



Jamberoo, New South Wales. 

 This locality was discovered by Mr. B. G. Engelhardt by whom 

 the mineral, which occurs in trachyte, has already been described.^^ 

 An anal3^sis was made on a specimen in the Australian Museum 

 presented by the original discoverei-, with the appended result : 



I. — Jamberoo ; taken for water -2755 gram, general -5593 gram. 



II.— Bordo, Faroes.'^" 



III.— Calculated for (Na.,,Ca) O. AI2O3. 6SiO.,. 6H.,0. 



" Hillebrand~ioc. cit., p. 37. 



1" Engelhardt— Proc. Linn. Soe. X.S.Wales, (2), vi., 1891, p. 5, pi. i. : -Inquet 



and Card^Rec. Geol. Sui-v. N.S.Wales, viii., 1, 1905, p. 17. 

 -0 Heddle— Min. Mag., i., 1877, p. 21. 



